Vacuum lines for EGR

So I got an older car. Great I thought until all the plastic vacuum lines that go from
EGR to the solenoid out fin it to a like 10 port junction and then lines everywhere to canisters and ports. I tried my best replaced EGR, throttle position EGR valve position, EGR solenoid, still think there a problem koeo I get 11 koer I get 12 94 44 18 before I dump more money into this what should I check? It shuts off when I get up to over 50. I also replaced the plugs and distributor cap.